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+// Example 4.3
+// Determine (a) Synchronous speed (b) Slip (c) Rotor impedance (d) Rotor current
+// (e) Rotor current if changing the shaft load resulted in 1.24 percenr slip 
+// (f) Speed for the condition in (e) 
+// Page No. 146
+
+clc;
+clear;
+close;
+
+// Given data
+fs=60;                  // Frequency
+p=6;                    // Number of poles
+nr=1164;                // Rotor speed
+Rr=0.10;                // Equivalent resistance
+Xbr=0.54;               // Equivalent reactance
+Ebr=150;                // Blocked rotor voltage per phase
+s1=0.0124;              // Percent slip
+
+// (a) Synchronous speed
+ns=120*fs/p;               // Speed 
+
+// (b) Slip
+s=(ns-nr)/ns; 
+
+// (c) Rotor impedance  
+Zr=(Rr/s)+%i*Xbr;
+// Complex to Polar form...
+Zr_Mag=sqrt(real(Zr)^2+imag(Zr)^2);         // Magnitude part
+Zr_Ang=atan(imag(Zr),real(Zr))*180/%pi;     // Angle part 
+
+// (d) Rotor current
+Ir_Mag=Ebr/Zr_Mag;                          // Magnitude
+Ir_Ang=0-Zr_Ang;                            // Angle
+
+// (e) Rotor current if changing the shaft load resulted in 1.24 percent slip 
+Zrnew=Rr/s1+%i*Xbr;
+// Complex to Polar form...
+Zrnew_Mag=sqrt(real(Zrnew)^2+imag(Zrnew)^2);         // Magnitude part
+Zrnew_Ang=atan(imag(Zrnew),real(Zrnew))*180/%pi;     // Angle part 
+
+Irnew_Mag=Ebr/Zrnew_Mag;                             // Magnitude
+Irnew_Ang=0-Zrnew_Ang;                               // Angle
+
+// (f) Speed for the condition in (e) 
+nr=ns*(1-s1); 
+
+// Display result on command window
+printf("\n Synchronous speed = %0.0f r/min ",ns);
+printf("\n Slip = %0.3f ",s);
+printf("\n Rotor impedance magnitude = %0.2f Ohm ",Zr_Mag);
+printf("\n Rotor impedance angle = %0.2f deg ",Zr_Ang);
+printf("\n Rotor current magnitude = %0.1f Ohm ",Ir_Mag);
+printf("\n Rotor current angle = %0.1f deg ",Ir_Ang);
+printf("\n Rotor current magnitude by changing the shaft load = %0.1f Ohm ",Irnew_Mag);
+printf("\n Rotor current angle by changing the shaft load = %0.2f deg ",Irnew_Ang);
+printf("\n New rotor speed = %0.0f r/min ",nr);